COOL: Caterpillars Sneak into Ant Nests by Singing like Queens. “Before they become butterflies, some caterpillars transform themselves into ants. Rather than living out in the open and braving predators while they grow up, these caterpillars sneak into ant nests for free food and lodging—or they just eat the ants. Either way, scientists have found, part of the caterpillars’ disguise involves mimicking the sounds of an ant queen. When worker ants hear this tune, they drop everything to tend to the mooching invaders.”